2019高中英语unit7thesea课时跟踪练（一）warm_up

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1、课时跟踪练(一)Warm-up&Lesson1—Pre-readingⅠ.阅读理解AAbout97%oftheworld'swaterissaltyandisfoundinouroceansandseas.But,aswecan'tdrinkseawater,howcanitbeimportant?Everypartofourseasandoceanscontainsanamazingnumberofanimalsandfishthatliveatdifferentoceandepths.Mostofthedifferentspeciesofanimalsandfishdepen

2、donsimpleplantsfortheirfood.Thesesimpleplantscalledalgae(海藻)driftnearthesurfaceoftheoceanandusesunlighttoturncarbondioxideandwaterintofoodandoxygen.Infact,algaeproduceoverhalfoftheoxygenpeoplebreathe.Howimportantseawateris!Eachplantoranimalinourseasandoceansisanimportantlinkinafoodchain.Theal

3、gaeareeateninlargeamountsbymicroscopicanimals,whichareinturnconsumedbylargeranimals.Thesefoodchainsaredelicatelybalanced.Thebadnewsaboutthefoodchainsintheoceansisthattheyareunderthreatbecauseofman.Peopleoncethoughtthattheoceansweresobigthatitdidn'tmatterifwedumpedrubbishintothemorcaughthugequ

4、antitiesoffishandwhalesforfood.Butwenowknowthisisnottrue,andfishstocksintheoceanshavestartedtodrop.Thankfully,theworldistakingstepstoprotectthefutureofouroceansbyintroducinginternationalagreementstoprotectmarinehabitats.Mostcountrieshaveintroducedfishingrestrictionstoprotectfishstocksintheoce

5、ans,andnewtechniquesarebeingpioneeredtocopewithpollution.Finally,theimportanceofprotectingoceansisbeingmadeknowntomorepeople.Thisisjustthebeginningofalongprocesstoprotecttheoceansforourfuture.Wedependontheoceansforfishwhichareanimportantpartofthehumandiet.Howimportantseawateris!1．Whichofthefo

6、llowingistheproperorderofthefoodchain?A．smallanimals→algae→microscopicanimals→largeanimals→manB．algae→microscopicanimals→largeanimals→largeranimals→manC．smallanimals→algae→largeanimals→microscopicanimals→manD．microscopicanimals→algae→largeanimals→largeranimals→man解析：选B　细节理解题。根据第二、三段内容可知答案。2．F

7、romthepassage,welearnthat________.A．mostfishandseaanimalsliveatthesurfaceoftheseasB．itisverydifficulttobreakthebalanceofafoodchainC．excessivefishinghascausedthedecreaseinfishstockD．itwon'tbelongbeforetheproblemsconcerningoceanswillbesolved解析：